Shed size · 216 sq ft
What fits in a 12x18 shed?
A 12x18 shed has 216 sq ft of floor. Drawn to scale with a clear aisle, it holds a lawn tractor, a zero-turn, a snow blower, a wheelbarrow, a workbench, 3 shelving units, and it can take a 42 in lawn tractor if the door is at least 5 ft wide. Kits this size cost about $3,927 in resin or $1,134 in steel at median prices.
A 12x18 is garage territory at 216 sq ft. It holds two machines and a workshop, but it is past every common permit exemption and needs a foundation you plan properly. Below, two common loads are drawn to scale on a 12x18 floor, so you can see what actually fits once you leave yourself a way in.
What fits in a 12x18 shed, drawn to scale
How many of each item fit in a 12x18?
Each row is that item on its own, packed flat on the floor with a clear aisle kept from the door. Hanging bikes and stacking bins beat these numbers; parking a mower across the aisle does not count.
| Item | Fits |
|---|---|
| Riding mower / lawn tractor (42 in deck) | 5 |
| Zero-turn mower (48 to 54 in deck) | 3 |
| Push mower (handle folded) | 12+ |
| Two-stage snow blower | 8 |
| Wheelbarrow | 10 |
| Adult bike (on the floor) | 12+ |
| Trash or recycling can (96 gal) | 12+ |
| Gas grill (off-season) | 12+ |
| Shelving unit (18 x 48 in) | 12+ |
| Workbench (2 x 6 ft) | 12+ |
| Kayak (floor) | 6 |
Is a 12x18 shed big enough for a riding mower?
Yes. A 42 in lawn tractor (about 4.5 x 6 ft parked) fits in a 12x18 with room to walk past it. The real test is the door: you need at least 5 ft of clear opening, so check the kit's door spec before the footprint.
Not sure about your own mix of gear? The shed size calculator adds up every item's footprint, multiplies by 1.5 for aisles and reach, and names the smallest standard size that works.
What does a 12x18 shed cost?
No kit in our catalog is exactly 12x18, which is common for this size: manufacturers cluster around 6x8, 8x10 and 10x12. At the median price per square foot we measured for each material, 216 sq ft works out like this:
| Material | Low (10th pct) | Median | High (90th pct) |
|---|---|---|---|
| Resin (HDPE) | $2,592 | $3,927 | $6,466 |
| Vinyl (PVC) | $2,806 | $4,371 | $5,753 |
| Steel | $666 | $1,134 | $2,844 |
| Wood | $2,194 | $4,500 | $7,115 |
Kit prices only. Budget about $300 for a 4 in gravel pad, around 8 anchors, and fit-out on top. The shed cost calculator totals it for your material and foundation.
Kits closest to 12x18
Nearest real footprints in our catalog.
Prices change often; the button shows today's price on Amazon.
Closest kits to 12x18
| Kit | Footprint | Material | Floor | Price |
|---|---|---|---|---|
| Arrow Classic Metal Shed | 12 x 17 ft | Steel | not stated | $920 |
| Arrow Shed Elite 14' x 16' Tall Outdoor Steel Storage Shed | 14 x 16 ft | Steel | not stated | $2,030 |
| Arrow Shed Elite 14' x 14' Tall Outdoor Steel Storage Shed | 14 x 14 ft | Steel | not stated | $2,055 |
| Arrow Storage Products 12' x 17' Murryhill Garage Galvanized | 12 x 17 ft | Steel | not stated | $2,900 |
| Little Cottage Co. 10x20 Value Workshop Shed | 10 x 20 ft | Wood | included | $4,069 |
| Handy Home Products Fairfax 10x20 DIY Wooden Storage Shed | 10 x 20 ft | Wood | not stated | $4,518 |
What foundation does a 12x18 shed need?
Most resin and steel kits want a flat, level, well-drained base a little larger than the shed. For a 12x18, that is a 14 x 20 ft gravel pad: about 5.3 tons of crushed stone at 4 in deep, or 8.0 tons at 6 in. A 4 in concrete slab takes 2.93 cubic yards (132 bags of 80 lb mix), and a paver base takes about 128 pavers at 16 in. Full quantities and costs are on the 12x18 shed foundation page.
Does a 12x18 shed need a permit?
At 216 sq ft a 12x18 is over every common exemption, so plan on a permit. Height limits (often 10 to 12 ft at the peak), setbacks of 3 to 5 ft from property lines and HOA covenants apply at any size, and wiring always needs an electrical permit. Run your numbers through the permit size checker, then check your local code.
Sizes next to a 12x18
- 12x17 shed (204 sq ft, one step smaller)
- 14x16 shed (224 sq ft, one step larger)
- 10x18 shed (180 sq ft)
- 12x12 shed (144 sq ft)
- 12x14 shed (168 sq ft)
- 12x16 shed (192 sq ft)
- 12x20 shed (240 sq ft)
- 12x24 shed (288 sq ft)
Fit out a 12x18
Wall storage is how a small floor holds more than the table above says.
Prices change often; the button shows today's price on Amazon.
Frequently asked questions
How many square feet is a 12x18 shed?
A 12x18 shed is 216 square feet of nominal floor area. Usable floor is a little less, because kit dimensions are usually measured at the roof or outside the walls, and resin and steel walls take up floor on every side. Compare the interior dimensions in the kit's spec sheet before you commit, especially if a mower or workbench needs every inch.
Can a riding mower fit in a 12x18 shed?
Yes. A 42 in lawn tractor (about 4.5 x 6 ft parked) fits in a 12x18 with room to walk past it. The real test is the door: you need at least 5 ft of clear opening, so check the kit's door spec before the footprint.
Do I need a permit for a 12x18 shed?
At 216 sq ft a 12x18 is over every common exemption, so plan on a permit. The International Residential Code exempts one-story storage sheds up to 200 sq ft, but many towns lower that to 120 or 100 sq ft, and setbacks, easements, HOA rules and any electrical work apply at every size. Check your local code before you order the kit.
How much gravel do I need for a 12x18 shed?
With a 1 ft border on every side, a 12x18 shed sits on a 14 x 20 ft pad. At 4 in deep that is 3.80 cubic yards, about 5.3 tons of crushed stone including 10 percent for compaction. At 6 in, for soft or wet ground, order 8.0 tons. Lay weed fabric first and frame the pad with treated timber.
How much does a 12x18 shed cost?
No kit in our catalog is exactly 12x18. At the median kit prices we measured, 216 sq ft costs about $1,134 in steel, $3,927 in resin and $4,500 as a wood kit, before a foundation of about $300 in gravel.
This page is researched guidance, not professional engineering, legal or building-code advice. Sizes, loads and permit rules vary by product and by town: check your local code and the kit manufacturer's instructions before you build.